Sure you can. Parros did it in Anaheim all the time and he got scratched more than he played because he wasn't a very effective hockey player.Plus you can't scratch a dressing room guy like Merrill after dropping the gloves to defend a teammate. These are the ups and downs of having a player's coach.
I understand being a player's coach but at some point you have to be a hockey coach and look at a guy and realize "boy, he usually isn't great, but tonight he was almost entirely responsible for the shift in the outcome of the game that lead to it becoming out of reach. And then in the third period he singlehandedly stifled any chance to claw some momentum back with a rock brained penalty. He needs to sit. He's having a negative impact on our performance."